The occurrence of planets and other substellar bodies around white dwarfs using K2
Abstract
The majority of stars both host planetary systems and evolve into a white dwarf (WD). To understand their post-main-sequence planetary system evolution, we present a search for transiting/eclipsing planets and other substellar bodies (SBs) around WDs using a sample of 1148 WDs observed by K2. Using transit injections, we estimate the completeness of our search. We place constraints on the occurrence of planets and SBs around WDs as a function of planet radius and orbital period. For short-period (P < 40 d) small objects, from asteroid-sized to 1.5 R⊕, these are the strongest constraints known to date. We further constrain the occurrence of hot Jupiters ( < 1.5 per cent), habitable zone Earth-sized planets ( < 28 per cent), and disintegrating short-period planets ( ∼ 12 per cent). We blindly recovered all previously known eclipsing objects, providing confidence in our analysis, and make all light curves publicly available.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2018
- DOI:
- 10.1093/mnras/stx3068
- arXiv:
- arXiv:1711.09691
- Bibcode:
- 2018MNRAS.474.4603V
- Keywords:
-
- methods: data analysis;
- occultations;
- planets and satellites: dynamical evolution and stability;
- Planetary Systems;
- white dwarfs;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- Accepted by MNRAS